Add CheckBox to each row in GridView and search records in GridView and highlight results using VB.Net in ASP.Net

Hi MasterPage,

I have created a sample which full fill your requirement

HTML

<div>
    Search:
    <asp:TextBox ID="txtSearch" runat="server" />
    <asp:Button Text="Search" runat="server" OnClick="Search" />
    <hr />
    <asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false" AllowPaging="true"
        OnRowDataBound="OnRowDataBound" OnPageIndexChanging="OnPageIndexChanging">
        <Columns>
            <asp:BoundField HeaderStyle-Width="150px" DataField="ContactName" HeaderText="Contact Name"
                ItemStyle-CssClass="ContactName" HtmlEncode="false" />
            <asp:BoundField HeaderStyle-Width="150px" DataField="City" HeaderText="City" />
            <asp:BoundField HeaderStyle-Width="150px" DataField="Country" HeaderText="Country" />
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:CheckBox ID="chkRow" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Me.BindGrid()
    End If
End Sub

Protected Sub Search(sender As Object, e As EventArgs)
    Me.BindGrid()
End Sub

Private Sub BindGrid()
    Dim constr As String = ConfigurationManager.ConnectionStrings("conString").ConnectionString
    Using con As New SqlConnection(constr)
        Using cmd As New SqlCommand()
            cmd.CommandText = "SELECT ContactName, City, Country FROM Customers WHERE ContactName LIKE '%' + @ContactName +  '%'"
            cmd.Connection = con
            cmd.Parameters.AddWithValue("@ContactName", txtSearch.Text.Trim())
            Dim dt As New DataTable()
            Using sda As New SqlDataAdapter(cmd)
                sda.Fill(dt)
                gvCustomers.DataSource = dt
                gvCustomers.DataBind()
            End Using
        End Using
    End Using
End Sub

Protected Sub OnPageIndexChanging(sender As Object, e As GridViewPageEventArgs)
    gvCustomers.PageIndex = e.NewPageIndex
    Me.BindGrid()
End Sub

Protected Sub OnRowDataBound(sender As Object, e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        e.Row.Cells(0).Text = Regex.Replace(e.Row.Cells(0).Text, txtSearch.Text.Trim(), _
            Function(match As Match) String.Format("<span style = 'background-color:#D9EDF7'>{0}</span>", match.Value), _
                        RegexOptions.IgnoreCase)
    End If
End Sub

ScreenShot